Ответ:

Вопросы строятся с нужной формой глагола to be: are с they/you, is с it/he.

  1. Are they in grade 5? Yes, they are.
  2. Are you 11 years old? No, I’m not.
  3. Is it a ruler? Yes, it is.
  4. Are you and Mary in the same class? No, we aren’t.
  5. Is he Mark? No, he isn’t.